Minor kickstart updates

* Using internal EPEL mirror
* Disable use of requiretty in sudoers file
Need rpmbuild to build SRPM packages
Updated centos builder

* Enabled NTP
* Mock config points to ephemeral storage
* SSH config for git repositories
Added Jenkins CI Server kickstart
Merge pull request #8 from mspaulding06/master

Centos Builder Updates and Jenkins Server Kickstart